patch 8.0.1257: no test for fix of undefined behavior

Problem:    No test for fix of undefined behavior.
Solution:   Add a test. (closes #2255)
diff --git a/src/version.c b/src/version.c
index e94b81a..65f5a4b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1257,
+/**/
     1256,
 /**/
     1255,